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Last time I had this I had to change the motherboard, tried for hours to find the fault. motherboards are about £50 if you have to resort to it. Make sure you are buying an original nintendo and not a copy
The alarm is just a coincidence i suspect, green light comes on and stays on probably not the battery at fault. It would be red. If the green light goes out and screens just flash one of your screens are at fault or a loose ribbon connection.
When you boot the Nintendo DS you can change the illumination settings in the main menu. One the main menu, you will find a sunny symbol in the lower left corner of the screen. Click on that and you should be able to change the level of illumination. If you are also wondering if you can change the brightness during game play, you can't. Games such as Mario 64 DS come with support for brightness change but otherwise you have to do it before game play.
It could be that your son dropped the DS. The screens are probbably not dead, but a connection may have come loose. The screen connection cables, especially the LCD power ribbon, are sensitive. You can try disassembling the DS by following any of numerous disassembly toutorials (search Google!) and make sure everything looks normal, that is, all the ribbions are tight.